visual studio 2015 - How to create an index for a string property in Entity Framework 7 -

i'm trying create code first model entity framework 7. i'm using released visual studio 2015 beta , following versions of entityframework packages (snippet project.json file):

"entityframework.sqlserver": "7.0.0-beta1", "entityframework.commands": "7.0.0-beta1", 

it looks no data annotations available , i'm using onmodelcreating override , implemented (partly?) migrations create model.

for now, primary keys , one-to-one relations work creating indices integer types. example:

builder.entity<article>(e => {     e.key(c => c.id);     e.onetoone<category>(c => c.category);     e.index(c => c.time).isunique(false); }); 

this snippet results in following migrations code generated:

migrationbuilder.createtable("article",             c => new                 {                     id = c.string(), // ...                     categoryidkey = c.int(nullable: false),                     time = c.datetime(nullable: false), // ...                })             .primarykey("pk_article", t => t.id)             .uniqueconstraint("uc_article_categoryidkey", t => t.categoryidkey);          migrationbuilder.addforeignkey("category", "fk_category_article_categoryid", new[] { "categoryid" }, "article", new[] { "categoryidkey" }, cascadedelete: false);          migrationbuilder.createindex("article", "ix_article_time", new[] { "time" }, isunique: false, isclustered: false); 

but when i'm trying add index string property, migration generated, when applied rejected sql server, apparently due column type being nvarchar(max). seems .required().maxlength(100) not force limited string column type generation. , though there method change column type, cannot seem find way call through modelbuilder:

        builder.entity<keyword>(e =>         {             e.key(c => c.id);             e.property(c => c.word).required().maxlength(100);             e.index(c => c.word).isunique(true);         }); 

resulting migration:

        migrationbuilder.createtable("keyword",             c => new                 {                     id = c.int(nullable: false, identity: true),                     word = c.string(nullable: false, maxlength: 100)                 })             .primarykey("pk_keyword", t => t.id);          migrationbuilder.createindex("keyword", "ix_keyword_word", new[] { "word" }, isunique: true, isclustered: false); 

is there way create index on string property in beta version of ef7?

unfortunately @ time (7.0.0-beta1), max length , column type metadata not honored when determining column type use. now, you'll have drop down raw ddl in migration.

// add before createindex migrationbuilder.sql("alter table [keyword] alter column [word] nvarchar(4000)");